Nuclear Dynamics of H+ + H+ Fragmentation in NH3 Following Direct Single-Photon Double Photoionization at 61.54eV
Abstract
We report measurements on the H+ + H+ fragmentation pathways in neutral NH3 following direct single-photon double photoionization at 61.54eV, where the two photoelectrons and two protons are measured in coincidence using 3-D momentum imaging. We observe four dication electronic states which contribute to H+ + H+ fragmentation, three of which exhibit equal energy sharing between the two protons, while the third exhibits strongly unequal energy sharing. We tentatively attribute the unequal proton energy sharing feature to multi-step fragmentation, while the other three equal proton energy sharing features are attributed to single-step fragmentation. Molecular plane proton momentum distributions for these states provide insight into the nuclear dynamics that emerge following direct single-photon double photoionization.
- Publication:
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APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- May 2018
- Bibcode:
- 2018APS..DMPC07009L